You can take it with you – momentum, that is!

One of the hassles of commuting in Wellington is that generally your home is higher than your work, so you heat up your brake pads in the morning descending the hill, then expend calories getting back up the hill in the evening.

Of course, hybrid vehicles like the Prius save the braking energy as battery charge, so it can be used to accelerate later on. But what about Bikes?